KR960010862B1 - Automatic channel converting apparatus in wireless transceiver - Google Patents

Abstract

an antenna (7) for receiving and sending radio transmission and reception signals; a radio receiver (5) for receiving a radio frequency from a radio communication device (20); a base signal demodulator (1) for demodulating an audio signal and a data contained in the received radio frequency; a signal detector (2) for determining the presence of a interference and jamming wave from the size of the input signal of the radio receiver (5); a controller (3) for controlling the change of channels; an oscillator and modulator (4) for generating a transmission frequency and modulating sound and data information to be sent; and a radio transmitter (6) for transmitting the radio frequency amplified under the control of the controller (3).

Description

Automatic Channel Switching Device in Wireless Transceiver

1 is a block diagram of an automatic channel switching apparatus of the present invention for automatically switching channels by detecting a crosstalk and a jammer by cutting off a radio transmission frequency.

2 is a block diagram of a call destination wireless device for communicating with an automatic channel switching device of the present invention.

* Explanation of symbols for main parts of the drawings

1: base signal demodulator 2: signal level detector

3: control unit 4: oscillation and modulation unit

5: wireless receiver 6: wireless transmitter

7: antenna 10,20: wireless device

21: base signal demodulator 22: signal level detector

23 control unit 24 oscillation and modulation unit

25: wireless receiver 26: wireless transmitter

27: antenna

Field of invention

The present invention relates to an apparatus for automatically switching channels during wireless communication. More specifically, it is possible to switch channels during a call between wireless transmitters and receivers, and when a noise and disturbance wave is introduced into a wireless telephone during communication, or when interference occurs with other peripheral wireless devices, it is automatically changed according to a predetermined agreement. The present invention relates to an automatic channel switching device that operates so that smooth communication is performed by switching channels.

Background of the Invention

In a wireless device that selects a communication channel by an MCA (Multi-Channel Access) method such as a conventional wireless telephone, a communication channel is first selected from a plurality of channels in a circuit before communication is performed to perform communication. The method was used.

That is, for example, the fixed device and the mobile device of the wireless telephone automatically search for a channel not used in another wireless telephone existing in the adjacent device among a plurality of communication channels, and select a channel not used for communication to select a channel of the wireless telephone. Communicate between stationary and mobile devices.

However, in the conventional MCA scheme as described above, it is not possible to select a channel once and change the call channel to another channel that is not used until the call is terminated. This caused a limitation in the channel selection, and the following problems arise.

In the event of interference or interference from multiple channels that are not in use, or from channels that are in use, interference or interference can be prevented until another wireless telephone, which is the source of interference, ends the call. It was not there.

As a result, in densely populated areas such as office buildings with dense wireless telephones, crosstalk frequently occurs during a call, and when noise or crosstalk is severe, it causes a serious obstacle to work. To prevent this, retry the empty channel that is not used for the call and try a new pass.

In order to solve this problem, a device capable of manually switching to another communication channel has appeared in a crosstalk area where wireless telephones are closely connected even when a call is interrupted due to crosstalk or radio interference.

However, since the manual channel switching device switches the channel by hand, it is impossible to accurately select a channel without crosstalk or interference, and it is difficult to switch quickly enough so as not to interfere with a call. This can be clearly seen by comparing the automatic selection for electronic channel selection and the manually selected selection time.

In order to solve the above problems, the present inventors have made the present invention to automatically switch a channel to another channel without noise and interference by periodically searching for a signal according to a predetermined agreement while a call is in progress. .

Claims (2)

A radio transmission / reception apparatus having an MCA system, comprising: an antenna (7) for transmitting and receiving a radio transmission / reception signal; A radio receiver 5 for receiving a radio frequency transmitted from the radio target device 20 for a call; A base signal demodulation section (1) for demodulating voice signals and data telegrams contained in the received radio frequency; A signal level detector (2) for determining the magnitude of the signal input to the radio receiver (5) to search for the presence of crosstalk and jammers; A control unit (3) for selecting a transmission and reception channel between wireless devices and determining the presence or absence of crosstalk and jamming signals based on the signal from the signal level detection unit (2) to control channel switching; An oscillation and modulation section 4 for generating a transmission / reception frequency and modulating voice and data information to be transmitted; And a radio transmitter 6 which is controlled to be amplified and transmitted by a radio frequency to be transmitted. The radio transmitter 6 is controlled by the controller 3, and the call is made after the radio transmitter 6 is turned off by the controller 3 during a predetermined contract time. Automatic channel switching device characterized in that by measuring the target reception level to determine whether jamming or crosstalk and switching to another channel without crosstalk and jamming. 2. The automatic channel switching apparatus according to claim 1, wherein said automatic channel searching operation interacts between wireless devices (10,20) to select transmission and reception channels, respectively.